diff --git a/agents/runner.py b/agents/runner.py
index 0db3819..471b683 100644
--- a/agents/runner.py
+++ b/agents/runner.py
@@ -45,6 +45,12 @@ def _build_claude_env() -> dict:
     Also resolves ~/.nvm/versions/node/*/bin globs that launchctl may not expand.
     """
     env = os.environ.copy()
+
+    # Propagate canonical DB path to agent subprocesses so they don't fall back
+    # to module-relative path (which breaks in worktrees — KIN-129).
+    if "KIN_DB_PATH" not in env:
+        env["KIN_DB_PATH"] = str(Path.home() / ".kin" / "kin.db")
+
     existing = env.get("PATH", "").split(":")
 
     extra = list(_EXTRA_PATH_DIRS)
diff --git a/core/db.py b/core/db.py
index 7b27293..5d8e47b 100644
--- a/core/db.py
+++ b/core/db.py
@@ -3,10 +3,11 @@ Kin — SQLite database schema and connection management.
 All tables from DESIGN.md section 3.5 State Management.
 """
 
+import os
 import sqlite3
 from pathlib import Path
 
-DB_PATH = Path(__file__).parent.parent / "kin.db"
+DB_PATH = Path(os.environ.get("KIN_DB_PATH") or (Path.home() / ".kin" / "kin.db"))
 
 SCHEMA = """
 -- Проекты (центральный реестр)